Freeing up a TCP IP port

Question

netstat -tulnap shows me what ports are in use  How to free up a port in Linux

User · Answer

In terminal type     netstat -anp grep  port number   It will show the port details  Go to last column   It will be in this format   For example  - PID java   then execute    kill -9 PID  Worked on Centos5  For MAC    lsof -n -i   port-number    grep LISTEN   Sample Response     java   4744  PID   test  364u  IP0 asdasdasda   0t0  TCP   port-number  LISTEN    and then execute    kill -9 PID    Worked on Macbook

User · Answer

Shutting down the computer always kills the process for me

User · Answer

sudo killall -9  process name

User · Answer

Kill the process that is listening to the port in question  I believe netstat shows you process ids

User · Answer

You can use tcpkill  part of the dsniff package  to kill the connection that s on the port you need   sudo tcpkill -9 port PORT NUMBER

User · Answer

To a kill a specific port in Linux use below command  sudo fuser -k Port Number tcp   replace Port Number with your occupied port

User · Answer

I think the only way will be to stop the process which has opened the port

User · Answer

As the others have said  you ll have to kill all processes that are listening on that port   The easiest way to do that would be to use the fuser 1  command   For example  to see all of the processes listening for http requests on port 80  run as root or use sudo      fuser 80 tcp   If you want to kill them  then just add the -k option

User · Answer

To check all ports   netstat -lnp   To close an open port   fuser -k port no tcp   Example   fuser -k 8080 tcp   In both cases you can use the sudo command if needed

User · Answer

The  quot netstat --programs quot  command will give you the process information  assuming you re the root user  Then you will have to kill the  quot offending quot  process which may well start up again just to annoy you  Depending on what you re actually trying to achieve  solutions to that problem will vary based on the processes holding those ports  For example  you may need to disable services  assuming they re unneeded  or configure them to use a different port  if you do need them but you need that port more

User · Answer

If you really want to kill a process immediately  you send it a KILL signal instead of a TERM signal  the latter a request to stop  the first will take effect immediately without any cleanup   It is easy to do   kill -KILL  lt pid gt    Be aware however that depending on the program you are stopping  its state may get badly corrupted when doing so  You normally only want to send a KILL signal when normal termination does not work  I m wondering what the underlying problem is that you try to solve and whether killing is the right solution

[linux] Freeing up a TCP/IP port?

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